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For mid-2013 MacBook Airs, Apple has released an SMC firmware update version 2.0 that addresses an issue that could cause the battery to drain unexpectedly quickly when the lid is closed.

SMC firmware update for MacBook Air 2.0
This update is recommended for MacBook Air (Mid 2013) models. The update addresses an issue that could cause the battery to drain unexpectedly quickly if the computer was closed.

This is Apple's second battery-related MacBook Air fix since last October version 1.9 addressed possible unexpected termination of battery operation.

You can download the latest update from the Mac App Store or on the Apple website.

Source: MacRumors
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